Unscrewing device.



. No. 661,855. Patented Nov. 3, |900.

A. DE vlLBlss, 1R.

uNscREwlNG DEVICE.

(Application filed Oct. 16, 1899.) (No Model.)

A A- mimn l UNITED STATES PATENT OFFICE.

ALLEN DE VILBISS, JR., OF TOLEDO, OHIO.

UNSCREWING DEVICE.

SPECIFICATION forming part of Letters Patent No. 661,855, dated November 13, 1900.

Application filed October 16, 1899. serial No. 733,740. dilo model.)

.T0 a/ZZ whom it may concern,.-

Beit known that I, ALLEN DE VILBIss, J r., a citizen of the United States, and a resident of Toledo, Lucas county, State of Ohio, have invented certain new and useful Improvements in Unscrewing Devices, (Case GQ and "my preferred manner of carrying out the invention is set forth in the following full, clear, and exact description,terminating with claims particularly specifying the novelty.

This invention relates to pumps, and more especially to the pistons used therein; and the object of the same is to produce means for disconnecting the parts (as in a suckerpump) which hold the washer in place. In the usual construction there is a cage or frame connected with the lower end of the pumprod and containing a valve, and to the lower extremity of this cage is screwed a ring, between which and said extremity is clamped the inner edge of a leather or other washer. The entire device is reciprocated by the pumprod within the bore of the pump, and it is well known to those who are familiar with this art that when it is desired to remove or replace a worn or damaged washer it is often very annoying to find that the members which were screwed together-have become so rusted as to be practically inseparable.

The object of the present invention is to avoid this difficulty and to make the members readily separable, to which end the invention consists in constructing the cage of a ring split into a number of pieces, each of which is attached to one arm of aspider whose hub is connected to the pump-rod, and in using a drive-ring which is forced down upon these arms, so as to draw the piecesof the ring inward wholly or at least partially into threaded engagement with a boss formed upon a solid ring which constitutes the valve-seat, all as hereinafter more fully described and claimed, and as illustrated in the accompanying drawings, wherein- Figure l is a sectional view of this invention with all parts connected and the drivering iniplace. Fig. 2 is a perspective detail of the parts separated.

In the said drawings, 1 is the pu mp-rod, connected, as by threads, to the hub 2 of a spider, whose arms 3 diverge slightly on their outer edges toward their lower ends, which latter are connected with the arc-shaped pieces 4t of a split ring forming the base of the cage for containing the valve 5.

l0 is the washer, of leather or other suitable material, and ll is the clamping-ring, shown in Fig. l as having a body of substantially L-shaped cross-section whose radiallyprojecting portion is flat on that face next the split ring and whose other portion, projecting longitudinally from the inner edge of the radial portion, constitutes a reduced boss l2, threaded on its exterior to take into interior threads within the split ring 4, so that the leather washer is clamped between the flat faces of the bodies of the two rings around the outside of said boss when the latter is Yscrewed into the split ring to a sufficient eX- tent.

20 is a drive-ring of stouter metal than that comprising the remainder of the device.

With this construction the parts are assembled in a manner which will be clear, the drive-ring putin place and driven downward until the threads of the two rings engage, and the upper ring is then screwed down onto the boss of the lower until the washer is clamped between them. The pump-rod is attached to the hub 2 and the device is employed as usual, and when it is desired to remove the washer the ring 2O is driven oif and the arms 3 will cause the pieces of the ringe to spring slightly outward, which will break the "rust and permit the two rings to be separated by ordinary unscrewing.

I do not confine myself to the use of this device solely in pumps, as it will be clear that the same will have great utility where any two members are to be separated which might be rusted together; nor do I limit myself specifically to the use of a ring with a valve, because it is clear that the piston might be solid without departing from the spirit of my invention.

What is claimed as new is l. The combination in a piston, with the rod, a spider secured at its center to the end of the rod, a series of arms integral with the spider and ext-ending therefrom away from the rod, their outer faces diverging from each other as they recede from the spider and their bodies springing normally outward from an axial line, and arc-shaped pieces at the ex- IOO tremities of said arms; of a solid ring hav.- ing a portion .standing within said pieces, means for detachably connecting these parts by a relative movement longitudinally, and a drive-ring surrounding` said arms and adapt-V ed when driven 'Lowa-rd said pieces to bind them upon the contained portion of the solid ring, as and for the purpose set forth.

2. In a piston, the combination with the pump-rod, a spider attached thereto and having diverging arms normally springing out-` ward, and a ring split into pieces respectively connected to the ends of the arms and each threaded on its inner radial face and flat at its end; of a solid ring having a dat face, a boss of reduced diameter projecting longi-V tudinally from the inner edge of this ring and threaded on its outer radial face to engage the threads on said pieces, a Washer clamped between the flat faces of the solid and the split rings, and a drive-ring adapted to be forced onto said diverging arms, as and for the purpose set forth.

3.Y lIna pump-piston, the combination with the pumprod, a spider attached thereto and having diverging arms normally springing outward, and a ring split into pieces respectivelyconnected to the arms and each threaded on its inner radial face and dat at its end; of a solid ring having a dat face, a boss of .reduced diameter projecting longitudinally from the inner edge of this ring and threaded on its outer radial face to engage the threads on said pieces, a valve-seat Within this ring, a valve therein Working within the spider, a

' Washer clamped between the dat faces of the 

